Paraformaldehyde: Poly

Hethoxyan11ine p-Anisidine (8) Benzenamine, 4-methoxy- (9) (104-94-9) Paraformaldehyde Poly(oxyraethylene) (8,9) (9002-81-7) p-Toluenesulfonic acid monohydrate (8) Benzenesulfonic acid, 4-methyl-, monohydrate (9) (6192-52-5)... 

Commercial polymerization of acetal homopolymer starts with anhydrous formaldehyde monomer from formaldehyde solution. Water is evaporated from the aqueous solution, forming paraformaldehyde, poly-oxymethylene, and hemiformal, which are purified and thermally decomposed to form anhydrous formaldehyde [6]. Methanol and formic acid are removed, either by freeze-trapping at a temperature just above the boiling temperature of formaldehyde or by washing with a nonvolatile polyol [6]. The anhydrous formaldehyde is fed into a reactor containing the inert hydrocarbon solvent, initiator, and dispersant, where the... 

Hexadienoic acid, 2385 Hexamethylenetetramine, 2477 Magnesium, 4690 Magnesium-nickel hydride, 4464 Paraformaldehyde, 0417 Poly(ethylene), 0782... 

The industrial synthesis of polyformaldehyde [poly(oxymethylene)] occurs by anionic polymerization of formaldehyde in suspension. For this the purification and handling of monomeric formaldehyde is of special importance since it tends to form solid paraformaldehyde. After the polymerization the semiacetal end groups have to be protected in order to avoid thermal depolymerization (Example 5-13). This is achieved by esterfication with acetic anhydride (see Example 5-7). As in the case of trioxane copolymers (see Sect. 3.2.3.2) the homopolymers of formaldehyde find application as engineering plastics. 

Hexadienoic acid, 2379 Hexamethylenetetramine, 2471 Magnesium, 4685 Magnesium—nickel hydride, 4458 Paraformaldehyde, 0416 Poly(ethylene), 0778... 

Geranyl chloride 2,6-Octadiene, 1-chloro-3,7-dimethyl-, (E)- (8,9) (5389-87-7) Paraformaldehyde (CHjO)n Poly(oxymethylene) (8,9) (9002-81-7) [Supplied by Alfa] or Paraformaldehyde (CH20)X (9) (30525-89-4) [Supplied by Aldrich, Fischer, Fluka]... 

Calixarene is one of the most easily accessible cyclophanes. Yamagishi et al. carried out the condensation of p-tert-butylphenol with paraformaldehyde in the presence of poly(ethylene glycol) (PEG), pseudopolyrotax-ane consisting of PEG axle and calixarene wheel was obtained [189] (Scheme 32). The wheel components removed from pseudopolyrotaxane were found to be mainly calix[8]arene which was accompanied with a small amount of calix[4]arene. It was discussed that calix[8]arene threaded PEG most efficiently among a mixture of calixarenes. 

Colocalization 1. Poly-l-lysine (20 pg/ml). 2. 4% Paraformaldehyde. 3. Cell-blocking buffer. PBS supplemented with 1% BSA, 0.1% goat serum, 50 mM NaCl, and 0.05% Tween-20. 

Surf Clam. Longo et al. (1994) have examined the Spisula lamin L67 in male pronuclei assembled in vitro. Nuclei are fixed in 3% paraformaldehyde in PBS for 1 hr and washed in PBS as described earlier. Fixed and washed nuclei are applied to a poly(L-lysine)-coated cover slip. Nuclei are reacted for 30 min with a 1 100 dilution of the anti-Spisula L67 Pab227 antibody. Cover slips are washed extensively in PBS, incubated for 30 min in a 1 20 dilution of FITC-conjugated antirabbit antibody, washed in PBS, and mounted in glycerol. 

Acetal, (Polyacetal) Poly-oxymethylene (POM) Acetal is a polymer obtained through an addition reaction of formaldehyde — (CH2—0) . It excels in mechanical performance and is regarded as a prominent engineering polymer. It appeared in 1959 with the commercial name Delrin . A short time later a useful copolymer was also developed with a cyclic ether like ethylene oxide. The monomer formaldehyde is a gas produced mostly by oxidizing methanol, and it is very useful in thermoset polymers like phenol, urea and melamine-formaldehydes. For high purity it is initially converted to trioxane or paraformaldehyde. The polymerization is carried out by ionic mechanism, wherein the monomer is dispersed in an inert liquid (heptane). The molecular weights reach 20,000 to 110,000. 

Myristalkonium chloride Myrtrimonium bromide Paraformaldehyde Phenylmercuric nitrate, basic p-Phenylphenol Pine (Pinus palustris) oil Poly (hexamethylenebiguanide) hydrochloride Potassium manganate Potassium permanganate p-Propiolactone Propionaldehyde Quaternium-18 methosulfate Sodium bisulfate Sodium fluoride Sodium iodate... 

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